Process of making sound-damping intermediate layers.



O. ROTHSO'HILD. ?ROGESS OF MAKING SOUND DAMPING INTERMEDIATE LAYERS. APRLIOATION FILED AUG. 15, 1912.

1 094 177 Patented Apr. 28,1914.

I lf zzvenzor: ZZ w I I 42.1441) ways 7X o'rtro no'rnscnnm, or-cnmb'r'rsnnmte, GERMANY.

raocnss or MAKING SOUND-DAMPING INTERMEDIATE LAYERS.

Specification of Letters Patent.

Patented Apr. 28, 191.4.

1 pplication flied August 15, 1912. Serial. mamm'oa.

7?) all whom, it may (6m Be it known" that .I, 'O'r'ro Ro'rnsoinm), a subject of the Kin'gfof Prussia, residing at Charlottenburg, in the Kingdom of Prussia, oGerman Empire, have invented certain new and useful Improvements in Processes of Making Sound-Dampin IntermediateLayers; and I do herebvdec are the following to he a full, clear, an 10 invention, such as will enable others skilled in the art to which it appertains to make and use the same. g

he suhjectmiatter oftmy invention is an improved process of making sound-damping intermediate layers.

Intermediate layers composed of pieces of natural cork moiuited in an iron frame are well known. They have, however, the disadvantage that inhot work-shops the moisture contained in the cork gradually evaporates,

causing the cork to shrink so greatly that it v is no longer held by the iron frame. surroundmg it.. It has heretofore been endeavored to' r obviate this defect by impregnating the cork with tar-oil. cork are, however, thereby impaired.

In-the drawing the figure 18 a perspective view of the frame holding the cork inplace.

- According to my inventioml obviate the I exact description of the The elastie properties of the defeat by heating the cork so highly, before it is placed into' the iron frame, that all the volume of the cork a is a minimum it is pressed into an iron frame Z), then placed in moist chan'ihers', in drder that it can absoih moisture, and is then covered by a protective coating of asphalt. If any moisture new escapes through the coating, the volume of the cork eanat-least be equivalent to that obtaining \vhenno moisture was contained inthe same, and will'not fall out of the frame because it'was pressed into the same when it had this volume.

A process of making means comprising aniron frame surroundmg cork. which consists in heating natural the moisture therefrom, and diminishing the volume of'the: same, in thereupon pressing the cork into the iron quently coating the cork with asphalt.

In testimony whereof I aflix my signature in present-e of two Witnesses:

, OTTO ROTHSCHILD. \Yitnesses: HUGH FAMATZKI, Ens Ham.

moisture is expelled from the cork. \Vhc'n' sound'dampin ork and thereby expelling 'siibstantially all frame, and in subse- 

